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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4782e998921ccfd438f08e0e267b4585661ea3dc3101981bd788e370ddef33d3' 
  AND token = '8etR/S22hGNibr8oZU9QYr2klIjFOOyd/6TsklGuzDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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