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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6367736a9d41a3c09d462bebc7cefd07595d4c226f0d7934b8962f2c7c99f662' 
  AND token = '+2ZNoJfTn7pjKEYNFZnuDO2hfFgW5k6W9xBKANQgjGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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