SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1020ad30b25688935e0dde01b214747ee6761dc9cb1140f698fc5800ad07ad1' 
  AND token = 'JquXBsU4nnGVp6HOnrqKYZ/a1pIwTwT3glpb43VhP20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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