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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684f7a6567293493958bb6659e4620a402eff5a0fd014157b76a330d6406d5c6' 
  AND token = 'Xf3DJENefLE5R8t23EqDPzbPjeMtZgwR6sKBec+ofTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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