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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc728f48835b006f99926e80d6d8bdbad7f0d9dffba976389c37936f28501881' 
  AND token = '9RvCL3ZgQwDzYHa20eyQIyfqipagQ5x6xh02vg88fqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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