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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2beddd05d7dd224eaec08de928ea63df77c28aa6d7606177e633492115aee84a' 
  AND token = 'qFltgJkg7SM5Ilo9SyvuDFeI0XsLrr2Gx9FENMCZIVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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