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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6070cf55bc3da813e9c9f8a2a7040eed9d45a20dea87ef1392bcc3feb4aab984' 
  AND token = 'l56yNT5M0EuRLvwFDpep0PFIFUccsyyPgAyb4MFpCbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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