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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03003e916a54d1455f76c7c76e5eccc76aab160adfe272aa7bd68b7ecbda6cf6' 
  AND token = 'UnbEXduz0h3O8H0kci+HmlBObtQVQFLjkcbimb0VbCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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