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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1e5126b4d45079cd1ea986d9c9c7aad630a9aa05f72e7e17427bda343ec284' 
  AND token = 'vLfm8uGiaPjIYxW68JynssO/z09T6Uytn1PaAaRW+XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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