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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8e191b27de9bdc8bd3624504fb1d95af788338785f9dd408a7b668a9e1789fe' 
  AND token = 'i3PqMT5UAMk0WCkTEKzRc453CEZP9+RHc2YWOTqzDas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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