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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6da964c0a571c2ac69e64f903c311c0799aede72afc2ce06dcfb97d770e4fd' 
  AND token = 'uYvY90AYst2HI/SL6yI/5kj/A0eYppaxSR9BCRBAGmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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