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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881a2719f6ca753f78e275441482c01bb2d9b403f507b6da976cb3775e5e1085' 
  AND token = 'E98JqTgH94GkZc4L+xHyrU9S8UjkOEkCAX9i7wJUmDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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