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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d93c2366ce761d1c76dd0e0107c79db468a35537d52297719e18ccd1627530' 
  AND token = 'ohHEAFN5bQmjBpofIHRDYIwQWs/X7AjC0BnqvZ0JT3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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