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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e480d1883d8e7a7a807a196fd26f6f2520e9dafcfeed2e6b7577137b8e53f73' 
  AND token = 'sTIg9J4rVkZEvqJ2ALEpaLfXjFpBKBLpXs19USRelOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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