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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c997e5eb4174a597e0bf0a1a687da48f6d0ba3331c0cad8844e4ac21a0b5565' 
  AND token = '65VMw8/2FXplaau+LmNzialc+/mBV5Bk2uiSJqMEKrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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