SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5e179fe9a1182b857f9060d924fcf0804c25529430a4326d32dffc8cf92722' 
  AND token = 'aigCmvduXSHjs6hJknoVPfsmJkZ96iHnqWJhhQWv/+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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