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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd24c6e259182ad3ad5bd50b043b51f48e5b8b84544ea6d421d9e2e2b0c4bba8' 
  AND token = 'GJyXhn1bHCZjUYUtBTUeOd7K3Kleh/pzeL1eW0TX3dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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