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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae86181015123a72408a96b70dc98babd348ef5f7242914654095b8d1fb5f7c' 
  AND token = '35vPxLsLjj4yiJSg4EOp1rue7X2O9vsGxsL/ekonfQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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