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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb571682bce091e5225cf5334a8515fa0f17d0eb8bdb24e2bb62cb49920ed702' 
  AND token = '7mN5y2e/8oVkfBImaO9yibgkGNCd9DSgutcvWYPVd+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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