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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb13ea50d19fe1b6bcd36c8ea04fd2afc549609287d78314419419adc518f94' 
  AND token = '4ULCfCNE9q+klpmYTxZ5hhMMIWoY/4nJJaLc/WHXe/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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