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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ae871d0ff13ab96d5339d6b915ad3e7e9e8781c8773eb0ce321ad2f52b0d89' 
  AND token = 'utSIQoonzu9cFWkb7Hdbu9ozBB/0hh4TaI05AyrlcO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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