SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e56cc5b496033f4531a96d357a9111e51c10be837f36a9890c7768b040281d8' 
  AND token = 'EGrxzVjPpOPYMpf3z/bxStQGvdqN26pB+fn31GNj4KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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