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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e2e22bc3c631983dd029dadec5167a5a3f28140c6f95dd0445994aa4897495' 
  AND token = 'cY9MNDgyfS8bu3dG9RHJHsyZSU1Z6/tRfxqvtzo+PnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}