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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ece743100b5ef7c3439ffd7e19a5f1fe924716822435e81fa15ca7924e7d1c' 
  AND token = 'sI+gOii7X8nFHjRZCe/KWRN6Oi80Dv1cHTpDL2wNHkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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