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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ede7f76b482be1e37cd8409ca96b5c4e3c5800ae4cb8e4609aff524e5ff112' 
  AND token = 'VUjiihbnSyiNvla6+SmXLxK2o2d81efp8Jtw0hUokMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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