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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb7f6f26afcad968559fa70683b963edfaf23f6217f742b9f1cacaeced06c17' 
  AND token = 'il8Nxp6Wpz8SMfndfVJluXrGa9P8q3ZkLoER7SqE8zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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