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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6eccb53561a63b5ae66a08cd1d7b8ab07324301c3c2a4b2456b6261f3e51bb' 
  AND token = '5dt22MkxSllM3yvFe1jUoNSzjNLqFzxmONJinCn0BLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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