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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40bdd71a71b0deccb29ab1eab54f39d0be8669a5fc1afafb7b9627da6dd4b96b' 
  AND token = 'OFF7axRz47VnK1i1LuJ21dbpFyvbNsPuskHkhYB9KF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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