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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894600ca6b18bd0e89368cdb5414dd768fe0223403e561ec4a8fd6d43433a573' 
  AND token = 'DWnhlhQQJ1tU5zSfACD8WGGkn8wzkdz63INb1nET0Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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