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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88b414f44a1e80228868ad26c858eca73156f7fe0104c202a506b641a4675d3' 
  AND token = 'afA2RXFIHAG/7jyhs7ey72neTV9EOpKgRDySe2+pU5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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