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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b93a1db8911747da108230f68b309e58d92c6760aeaed2f47c758c450840b1' 
  AND token = 'bwerwCWot3Xrc5ggM6fBD3WF0MldBKW+k6PJiwk0kzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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