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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a0b76bdc917011002584145786d0f326fa15c67e0e4433269f60b3aa24be7c' 
  AND token = '5KHDpZUXczqeJSudFtkGWycX2NyGrsoGP1ibV3RqtI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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