SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2d39b645978faa4290eafcdf8a92f12b5bb7a881c18b133414da9cc2c3ea62' 
  AND token = 'hIzBGt5uCmUVqYgDHgVtcYZfQuti0qzqguCP+Hl7g3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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