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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10bde83879cc90748ebb2ea6ad8939e2a88002f9e1918be81f1545a4abb49d11' 
  AND token = 'WSZqxeFxzGZ7HfrwYzyaBd30yAoUs/qA4Zqe9MPG4pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00839

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}