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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46a60b0ca23ea37a350a562c458cf8ef8230e5a387c3ec05306fa9641fef47a' 
  AND token = 'uezfTxTXizClzqoLbdNIhZw3wfibpQLT1BaMjCl6R9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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