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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca84f20c13e4b7c48da5ee4fe6558c88cb6a0055e653e5f53e210e513e31e7d' 
  AND token = 'JhFGyJJir6quWu17XXSXqboCzxQSibMR069+Lt2hWmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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