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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6d9f2bc5cb0d61b83f1cf3273fab16bfeb266d72a666bc8ace5a09f902e843' 
  AND token = 'NKowbX218Ek+eXieps9DHS7eUUcSzrxqar85wTrBq0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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