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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b6293387edf68f99e8ae3fc278fb08f9c7580c66362b6392b0ef715d49d6b2' 
  AND token = 'idiO31Ca9TrBoggGnBHg0rTb03sZ3HXARgHR3TLlCVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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