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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfc0916846225b1379c4f4fcf5f78f50995941b42c077ba94afdeabd54a30f4' 
  AND token = 'NhmSx3bV4UqXjH2znP4SZHMYx3qk1jAXSaU7vaomi6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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