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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af6679ec8c9bedaefc0831eddb5e19d1a8380cbfe372d847642004a4da973f4' 
  AND token = 'tjxlfDic0dMxW92Xf+VZHIt7QwIoi3p5H5R5YJ9yt/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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