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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e446fb25f8166f2f09e3d7865dad9d309305b2395ef1ed864ef029f045762789' 
  AND token = 'zgf6qwXOOqVRwWdUso7xmspU4ShHX9X9saBN+sHIbkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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