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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d0afa28332cf57ae13a26f4fa246ee345c87500a18ae635af53cad0c2b14c0' 
  AND token = 'gHmTcaHx+s8VGhlbQtsWEpgU+Zg4uiWdtE8k8AeONoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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