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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e114ea470ebf8ec2808feb3718ccae45622e0524dc77e5ec71d90248af2cdc4d' 
  AND token = 'JM8Poexut4S7D00Oj4T+vLvPMR+sVW0lJdsEfqHDg48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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