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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555cfa6fe3a2c51d449c666c80537d7ffa93393b5e35e7a37d971d485f7d85c9' 
  AND token = 'qFHDT5KjFeDYCLV7YW96G+rBESbzVaq8JpzI5n7Ud8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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