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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dab5f6553e1c82b29c925d9c1ffe2f4885a4fdafad1c5c7eac778aa190eb300' 
  AND token = 'q3Y47N71FLUoZbS72R9IKe3nhauVnWDS5NvJ1CbSxeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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