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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cdc19dc2c5341ae6bacaa576f5c593f1fc09956ddc5caea1315ad0f17177d1' 
  AND token = 'cgN5J3WQXPG/9MBTpnN92UdN/lDuEhZ1k4TiEUeq4VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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