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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dea60d6856c6b25daf9c11d53c8407be8a043bb61ce14af44ce69877501dfcb' 
  AND token = 'MZd2ZzWLp1SaWNdDa7dLkopKXd8DioFJwyhaZrW92A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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