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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1321a047c6bd55c0df7e4789baba7eed80d89e6573d27d4028565882a3f76c' 
  AND token = 'BD6yiFzkfAM74Q4jQ8uSePORhM7DxZBIu0RycXa9m/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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