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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a833fe758c22ba4e5a208db6c873ecd850b807566327628577ab15d12a1605c7' 
  AND token = 'bCxxlaHtD10jfzFaZwnZ0hBKGedPHOB7yMtq12h8eR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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