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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5aaa87a711bc45166be3dd560dad9af51e8d971d57a853f73eace784c1e40d' 
  AND token = '6aMqpcomTnlun3+Akadx8m89Swv4QGd1sGYpLeT6+/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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