Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396ea75d7183eea3eca12f09a04bf88454cd96fdf2ccd7001b96a5be853df9b7' 
  AND token = 'LBu1finhkmJOkPczrFulhe3fnmT3+dAmovABcvvBHns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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