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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c7a21b8685f864794887b310f29d2baa4bd385b212bfc00c3ea14e386dab2f' 
  AND token = 'a0bY2HTAxvhYZuXwEwA+tYzgsQo49bgtRFkhreDOAJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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