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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa46d899e51832e4c335a382bc37da106a769139798adbd96c656890db59ae3' 
  AND token = 'zfe+n2PV+67FtmJiWqYfjtwxnAs7hQkwxq9Wpns5uTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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