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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e669f503e715ab1b005caf5249f261f91061819aa0ca3846de46112b6f2feca' 
  AND token = 'O57QM6/dBazAPIGafDnbfqQjMGXG1L08w5gmnH5AwVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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