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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4276a763b5dc33383f34c53b221193d9b72799f6e545b1938bd607b9edfb0c64' 
  AND token = '3GzgBchmCaebJ8h3sv41q1cC8jz0rCNSVUP7xxtqOJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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