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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74dff0ca2b3f6c14641852ea895cfbf63e6479e73a1fd20af59872cb86feafd' 
  AND token = 'juA0aWErxpPoq7PQ7E5uJ8C2N5U/wtlB0zut9T9JFnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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