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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575a57b987c7df6d00df21fe4ecd40be077db712f9a7e5906533171b61b69883' 
  AND token = 'XToo3+bh9AqBAi8H7W1BRbsjldRXUnvDZDWbKa7M6no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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