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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d2879a421903d527f14150291470e5bf0b098f5e0c9297f673900f49f3737b' 
  AND token = 'TyoDkLqQmq2aqb2LfXDXwuneq4qfwlO2PrgRl8BaqLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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