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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485423cb242b277bd1196845c544c7e9f5e26f9581e1e8b30fa1e111f15d225a' 
  AND token = 'asb5Uq37luGec9E8yCDigUiVWcC6VeGLTPAtXUmj2d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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