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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbf580edec6b3548a8ab4b142da6f70ef47d9971a4288b076cd67316f544615' 
  AND token = 'zHntlqnfCEcx/5/kylQu5wmoGTscW4YzMk+TTi16/wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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