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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9caf16415a4592e6342a5cea82c5d58727cd1f9ff4ccafa3890c647d2db0e7c6' 
  AND token = 'DwfRszkP5K4Z5WrEC+5pFFHeT2qkmKf8Lnurv6NSVdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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