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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45e22b7fedcdc351afdefa87b50c4feaeeed1f483a2cd03032f854bd9b665d58' 
  AND token = 'wcCovn5VdcObxH6SUk+STbKDg4WfJNufaLz8dr0/kR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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