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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778156dbc542a7fca63c749df9872b5260591114c96827be93ecb081fc7da85f' 
  AND token = 'H5f1TerZnhv6CutTNJG398vtDe0yXJHYhblIY1b6xFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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