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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4272f00805261d38a0b7feb6f57e8698c7f54590ceff66e0df64642101eebe' 
  AND token = '0+XPWvS9DESYB5TXqzrVYBr4QZb1W4gBdcmAxt2I+wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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