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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe4dc62885e54d8740668fc4126641c95273c1405116dda84aa1d1c98a4ebb4' 
  AND token = '4AgbxQvp63zoo52snpt2UduUKlF0HzHm25T7DcdVY9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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