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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca00b97d55458e8be5ba6fa4a5d4fc8966c227394f4630f3993db146430fef72' 
  AND token = 'aV7gpsRx5n2KCBbbrpFnYNpt+yywd+cqe7TZ1inyBOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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