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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f426853d70cb1ec68b6a992fe3a5379f7ef323bb9b4cd90588f90a95992d00' 
  AND token = 'H97Ti6sxExUud8IlgL8P+RlklUrxSPcbYL59dxr8MeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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