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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f46ee3453fec4d0ae3b59d4c2d4a6e141b50f8e5dad4f310eee48eecaf660df' 
  AND token = 'JDDVbkiWr4OxlFcw+KWihTKWdR/HUGCfje/oU0BuL/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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