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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b17561057a9861a4f0900af1651378ea716b60c5382491b838f6d074f39c8bb' 
  AND token = 'KWbBVBMs/uPWlCw2rEaHrH/13WdJ1WQV/seBKh97+pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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