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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3c590ab03001fee4ae5985b9da151c2466fa01ac5b649df73687915e4b4ad4' 
  AND token = 'RDdXB9sLGtbmWB2js2PikwbUWA4kVWCf6fR6NE+peus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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